Preparation

Cook garlic in 2 tablespoons oil in a small heavy skillet over moderate heat, stirring, until pale golden, about 30 seconds. Transfer garlic with a slotted spoon to a small bowl and reserve oil separately (to prevent garlic from continuing to brown in hot oil).

Simmer 1/4 cup vinegar with shallot and brown sugar in a 1-quart heavy saucepan, uncovered, stirring occasionally, until liquid is reduced to about 1 tablespoon, about 4 minutes.